I'm seven minutes into this. Picture and sound quality are pretty poor, and volume could be better. But lecturer's diction is clear and reasonably-paced. A pity she hasn't identified herself - so far, at least. I'll probably stop here, and play these 7 minutes over a few times more - let's hope my comprehension has improved by then! (At the moment, it's about 25% - if I concentrate hard! Wish me luck!) By the way, this is my first visit to the Internet Archive. I've spent a happy hour blundering about. This would have to be one of the most user-unfriendly websites I've come across. What irony, given that its whole rationale is "open access!" Never mind - I suppose it's a bit like learning Chinese: the task seems impossible at first, but if you stick at it, progress is possible (I think!) How do I communicate with those 200 people who have downloaded this lecture? I can't find a relevant forum!